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Have you tried to disconnect the oil tank alarm and see it it still sounds?
ok, there is one other sensor on the engine that will sound the beeping alarm. That is the water sep filter. Remove it from the engine and pour it into a glass jar. Allow it to settle and see if there is more than one layer in the jar. If so, there is water in the fuel and it will need to be pumped out of the tank before you use the boat.
Ok, it the beep a rapid beep or more of a beep, pause, beep.
Have you removed the drive to the oil pump and inspected it? The bushing could be binding slightly in the block and causing this alarm.
That would need to be the next check. You can rule out overheat since that would be a solid horn.